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The point of sperm entry defines the dorso-ventral axis - cells opposite the region of sperm entry will eventually form the dorsal portion of the body. [ 1 ] [ 3 ] In the frog Xenopus laevis , the animal pole is heavily pigmented while the vegetal pole remains unpigmented. [ 4 ]
Tricyrtis is a genus of Asian flowering plants in the lily family, with approximately 20 known species.The species are commonly known in English as toad lilies. The genus has a native range from the Himalayas to eastern Asia, including China, [3] Japan, [4] Philippines and Taiwan, [5] and a few species are cultivated for their ornamental qualities in other parts of the world.
The western toad (Anaxyrus boreas) is a large toad species, between 5.6 and 13 cm (2.2 and 5.1 in) long, native to western North America. [ 1 ] [ 3 ] [ 4 ] A. boreas is frequently encountered during the wet season on roads, or near water at other times.
Adult males on average are between 2.4–3.1 inches and females are 2.9–3.9 inches [3] Their coloration can range from brown to green and they have a distinct white mid-dorsal stripe. Both sexes have dry, warty skin and oval parotoid glands. Male boreal toads have no vocal sac and therefore have no mating call.
The African common toad is a large sturdy toad with a warty skin. Males grow to a snout-to-vent length of 62 to 91 mm (2.4 to 3.6 in) and females reach 70 to 130 mm (2.8 to 5.1 in). The paratoid glands are large and either parallel or kidney-shaped and the male has a single vocal sac under the chin. The dorsal surface is dark olive-brown with ...
Rhinella icterica possess specialized cells found among the glandular cells in mucous layer of the esophagus. In addition, the stomach of Rhinella icterica has four distinct layers that shows the same pattern as the esophagus. these specialized cells are called the oxynticopeptic cells and are responsible for the production of hydrochloric acid and pepsinogen Its stomach is made up of a simple ...
Australian park rangers believe they have stumbled upon a record-breaking giant toad deep in a rainforest. Dubbed "Toadzilla", the cane toad, an invasive species that poses a threat to Australia's ...
A Californian toad doing an aggressive call. The California toad is less blotched (reduced dorsal melanin) than the boreal toad. It has a wider head, larger eyes, smaller feet, and a weaker development of the margins along the dorsal stripe. The largest western toad larvae at 56 mm is also of the California toad. The toad has a wide range of ...